list1 = [105, 202, 208, 300, 76, 55, 'c', 'm', 'car', '78', 100, 'm', 'n']
int_list = []
str_list = []
for l1 in list1:
    if type(l1) == int and l1 % 3 == 0:
        print('int:{}'.format(l1))
        int_list.append(l1)
    if type(l1) == str and l1.isalpha():
        print('str:{}'.format(l1))
        str_list.append(l1)
else:
    print(int_list)
    print(str_list)